GFS2: Only do one directory search on create
Creation of a new inode requires a directory search in order to ensure
that we are not trying to create an inode with the same name as an
existing one. This was hidden away inside the create_ok() function.
In the case that there was an existing inode, and a lookup can be
substituted for a create (which is the case with regular files
when the O_EXCL flag is not in use) then we were doing a second
lookup in order to return the inode.
This patch merges these two lookups into one. This can be done by
passing a flag to gfs2_dir_search() to tell it to just return -EEXIST
in the cases where we don't actually want to look up the inode.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/dir.h b/fs/gfs2/dir.h
index 98c960b..d3f2738 100644
--- a/fs/gfs2/dir.h
+++ b/fs/gfs2/dir.h
@@ -18,7 +18,8 @@
struct gfs2_inum;
extern struct inode *gfs2_dir_search(struct inode *dir,
- const struct qstr *filename);
+ const struct qstr *filename,
+ bool fail_on_exist);
extern int gfs2_dir_check(struct inode *dir, const struct qstr *filename,
const struct gfs2_inode *ip);
extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,